{"id":8663,"date":"2022-11-18T08:00:00","date_gmt":"2022-11-18T07:00:00","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&p=8663"},"modified":"2022-11-18T08:41:37","modified_gmt":"2022-11-18T07:41:37","slug":"delta-kick-squeezing-enables-quantum-enhanced-atom-interferometry-robin-corgier-lcar-seminar-18-11-22-11h30","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/delta-kick-squeezing-enables-quantum-enhanced-atom-interferometry-robin-corgier-lcar-seminar-18-11-22-11h30\/","title":{"rendered":"Delta-kick Squeezing enables Quantum-enhanced atom interferometry (Robin Corgier \/ LCAR \/ Seminar). – 18\/11\/22, 11H30"},"content":{"rendered":"

Robin Corgier<\/span><\/strong> <\/span>(LNE-SYRTE, Observatoire de Paris, Universite\u0301 PSL, CNRS, Sorbonne Universite\u0301, Paris, France)<\/p>\n

Summary<\/strong> : The possibility to overcome the standard quantum limit (SQL) by engineering specific quantum correlations between the atoms is attracting increasing interest in the field of atom interferometry. Recently, Bose-Einstein condensates (BECs) have been pinpointed as optimal candidates for the realization of entanglement-enhanced atom interferometers with spatially separated arms either in trapped [1] or free-fall [2] configurations. However, either due to the presence of residual interactions during the interferometer sequence or due to the fast expansion of the BEC during the state preparation, only a modest sub-SQL sensitivity gain is predicted.<\/p>\n

To overcome these problems, we recently proposed a novel method we refer to as Delta-Kick Squeezing (DKS) [3]. This method involves the rapid action of an external trap focusing the matter-waves to significantly increase the atomic densities during a preparation stage. This method is explored in the two relevant cases of Raman or Bragg scattering light pulses. In the second case, we demonstrated the possibility to implement a non-linear readout scheme making the sub-SQL sensitivity highly robust against imperfect atom counting detection [4,5]. We predict more than 30 dB of sensitivity gain beyond the SQL, assuming realistic parameters and millions of atoms in the BEC.<\/p>\n

In this colloquium, the main differences between Raman and Bragg interferometry sequences will be introduced as well as their respective impact in the generation of squeezing through the \u201cOne-axis twisting dynamiques\u201d. The advantages of the Delta-kick Squeezing method will then be discussed. Last but not least, I will highlight a promising scheme to perform quantum-enhanced differential atom interferometry based particle-entanglement and mode-entanglement [6].<\/p>\n

References:<\/strong>
\n[1]<\/strong> R. Corgier, L.Pezze\u0300, and A. Smerzi, PRA 103 (2021).
\nNonlinear Bragg interferometer with a trapped Bose-Einstein condensate
\n[2]<\/strong> S. S. Szigeti, S. P. Nolan, J. D. Close, and S. A. Haine, PRL 125 (2020).
\nHigh Precision quantum-enhanced gravimetry with a Bose-Einstein condensate
\n[3]<\/strong> R. Corgier, N. Gaaloul, A. Smerzi, and L.Pezze\u0300, PRL 127 (2021).
\nDelta-kick Squeezing
\n[4]<\/strong> E. Davis, G. Bentsen, and M. Schleier-Smith, PRL 116, 053601 (2016).
\nApproaching the Heisenberg limit without single-particle detection.
\n[5]<\/strong> O. Hosten, R. Krishnakumar, N. J. Engelsen, and M. A. Kasevich, Science 352 (2016). Quantum phase magnification
\n[6]<\/strong> R. Corgier, M. Malitesta, A. Smerzi, and L. Pezze\u0300, ArXiv 2205.09698 (2022), Spin-squeezing swapping for differential measurements with atom interferometers and clocks.<\/p>\n

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